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Case analysis of tubular screw conveyor in bean food conveying

by:YiFan     2021-04-05
2015-11-04 09:36:44    Tubular screw conveyor is a professional conveying equipment for conveying bulk materials. It mainly relies on the rotation of the screw blades to transport the materials, so that the material does not rotate with the screw conveyor blades. The weight of the material itself and the frictional resistance of the screw conveyor casing to the material. The spiral blades welded by the rotating shaft of the screw conveyor, the surface of the blade has solid surface, belt surface, blade surface and other types according to the different materials to be conveyed. The screw shaft of the screw conveyor has a thrust bearing at the end of the material movement direction to give the axial reaction force of the screw with the material. When the length of the captain is long, the middle suspension bearing should be added. The screw conveyor is deeply affected by many factors when conveying bulk materials. The technical department takes the conveying of legumes as an example for everyone to analyze as follows.  1. The influence of groove depth on conveying capacity    The groove depth of conventional tubular screw loading conveyor has a very significant influence on conveying capacity, and also affects the strength of the screw. Therefore, the groove depth is an important structural parameter of the screw loading conveyor. The powdery materials are compactable, so that the larger the groove depth, the better the conveying capacity when conveying powdery materials; while the material conveyed by the screw conveyor used in the particle injection system in the particle impact drilling technology is spherical particles, almost without Compactibility, so the law of screw groove depth and conveying capacity for conveying powdery materials is not necessarily suitable for screw conveyors used in particle impact drilling. It is very necessary to study the relationship between screw groove depth and conveying capacity here. Bean food with a particle size of d u003d 6.5 mm was used as the material to carry out the transportation test, and the screw 1, screw 2, and screw 3 were used for the test respectively. The parameters of each screw are shown in Table 1, and the test results are shown in Fig. 2.   Figure 2 Effect of groove depth on conveying capacity    Fig. 2 shows that groove depth is closely related to conveying capacity. The relationship between groove depth and conveying capacity is a second parabola. The deeper the groove, the faster the conveying capacity increases. There are large gaps between the bean food particles, the surface of the particles is relatively smooth, and the friction between each other is relatively small. The slippage of the bean food during the conveying process is accompanied by its own rolling, and there will be no conventional conveyor conveying powder. The phenomenon that the material often forms a solid plug in the screw groove to wrap the screw when the material is shaped, which affects the conveying capacity. When the required delivery volume changes, the required screw groove depth can be determined by adjusting the speed and the curve shown in Figure 2 to achieve the delivery volume change. 2. The effect of the gap between the screw and the barrel wall on the conveying capacity. In the previous test, the problem of spherical particle clamping was solved by increasing the gap between the screw and the barrel wall. It can be seen that the gap between the screw and the barrel wall is for conveying hard materials such as steel balls. Because of the important structural parameters of the screw conveyor, it is necessary to explore the influence of the gap between the screw and the barrel wall on the conveying capacity in preparation for subsequent engineering applications. Bean food with a particle diameter of 6.5 mm was used as the material for the conveying test, and the screw 4, screw 5, and screw 6 were used for the test respectively. The parameters of each screw are shown in Table 2, and the test results are shown in Fig. 3.  The material conveyed by the screw conveyor used in the injection system in particle impact drilling is spherical particles, and its surface is smooth, which is very different from the properties of powdered materials. Therefore, it is still necessary to determine the influence of the barrel wall and screw roughness on its conveying capacity. In the laboratory, a steel ball with a particle size of d u003d 2.5 mm is used as the material for the conveying test. The screw parameters: outer diameter 86 mm, inner diameter 50 mm, pitch 100 mm, screw edge width 10 mm, and unilateral clearance between the screw and the barrel wall 7 mm. At the same speed, the red bean with d u003d 4.5 mm has high conveying capacity, followed by steel balls with d u003d 2.5 mm, and the lower conveying capacity is beans with d u003d 6.5 mm. food. It can be seen that the particle size of the material has a certain impact on the conveying capacity, too large or too small a particle size will cause the conveying capacity to decrease. If the particle size of the material is too large, the gap between the materials will increase, and the space of the barrel will be wasted, making the space occupied by the conveyed particles relatively small and reducing the conveying capacity; the particle size of the material is too small, making it lie between the screw and the inner wall of the barrel. There are more particles in the gap between the screw and the barrel wall. The driving force of the particles in the gap between the screw and the barrel wall is only the interaction force between the particles, resulting in a small axial velocity, and the greater the number of particles in it. , The poorer the conveying capacity.
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